工具钢渗氮后的韧性和抗弯性能

最近，对经渗氮和未渗氮的AISI H13、AISI D2、K340、AISI D6和AISI M2等工具钢进行了详细的研究。采用了不同的渗氮工艺，包括气体渗氮、液体渗氮以及液体渗氮＋扩散处理，并进行了对比。对这些钢进行了弯曲试验和冲击试验，以评定其性能。用光学金相技术表征其显微组织。渗氮处理会降低无缺口冲击试样的断裂模数和冲击吸收功。由于扩散层较深，导致经气体渗氮处理的试样的力学性能下降。通过扩散处理来减薄液体渗氮试样的白亮层厚度并不会影响试样的力学性能。试验结果表明，渗氮对工具钢的最有害的影响是使冲击试验的冲击吸收功降低。

Toughess and Bending Resistance of Nitrided Tool Steels

Recently a detailed study was performed with nitrided and non nitrided tool steels including AISI H13,AISI D2,K 340,AISI D6 and AISI M2.Different nitriding processes including:gas,salt bath and also salt bath plus diffusion heat treatment were performed and compared.Performance of the tool steels was evaluated using bending tests and impact tests.Microstructure characterization was performed using optical microscopy.The nitriding treatment prompts a reduction in the rupture modulus and absorbed energy in un-notched impact specimen.The lower mechanical properties were obtained in the gas nitrided samples due to the deeper diffusion layers achieved by these thermo-chemical processes.The reduction in the white layer thickness by the diffusion treatment in the salt nitrided samples,have no effect in the mechanical response of the tested samples.The results show that the impact absorption energy tests show the worst effect in terms of reduction due to the nitriding processes.